Malicious PDF — malware analysis report

Static analysis result for SHA-256 676f5a2fcd8016aa…

MALICIOUS

PDF

40.4 KB Created: 2020-03-29 14:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 33339db6fba4763eae778e6dc16451be SHA-1: 9fe92bcb0c3ed130fafd318635457c7981634a0f SHA-256: 676f5a2fcd8016aadffaa1b2068ce67c730f9334101290f26455890d80ed6e30
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to PDF files hosted on various domains. The document body, though partially corrupted, includes a URL that appears to be a lure for a game or resource. This suggests a link farm or redirection tactic to distribute malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://74-123-73-226.mgwnet.com/uploads/1/3/0/5/130551154/130551154.html#palabras+mas+dificiles+para+el+ahorcado
    • http://nastybritches.com/uploads/1/3/0/2/130288412/80bff6b14d.pdf
    • http://heavyequipmentconsulting.com/uploads/1/3/0/3/130313067/8296853.pdf
    • http://lesculturesdumonde.org/uploads/1/3/0/2/130288465/suwupuvobu-palasopaz-ludimu-kikadutoru.pdf
    • http://sanacuro.com/uploads/1/3/0/5/130551401/3461012.pdf
    • http://tigervcamo.com/uploads/1/3/0/4/130435500/luzabazexake.pdf
    • http://berdingweil.org/uploads/1/3/0/2/130289775/maxovotebap-wisofumerarojo-nebejeb.pdf
    • http://gaulkeforassembly.org/uploads/1/3/1/4/131409526/vukekevado-xexax-mudefu.pdf
    • http://newenglandmasonry.net/uploads/1/3/1/1/131163616/9742899.pdf
    • http://martinbilling.net/uploads/1/3/0/3/130323996/wevudaf-junigiga.pdf
    • http://mexitem.com/uploads/1/3/1/3/131398345/jikutete.pdf
    • http://wpcg.org/uploads/1/3/0/5/130589121/keferopudal.pdf
    • http://3econsulting.org/uploads/1/3/0/6/130639503/kufokulad-detolol-sitofupiwa.pdf
    • http://movalhome.net/uploads/1/3/0/2/130271211/tipek-xedikumato-wibofenidesil.pdf
    • http://donnadoss.com/uploads/1/3/1/1/131163834/repewabebewop-xorowuza.pdf
    • http://blazinblazer.com/uploads/1/3/0/6/130639884/925abf23.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071ef.bin
75257c02e14e261f8987ebcf0bc823c000fd436076de8e6085c783297c88d744		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71EF 9136 bytes

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